Victor, here's the thing. I can tell the differences in asians too, mostly because there is differences dependant upon what I'm gonna just call nationality.
This is how it works, White girls have tons of variation, like every girl if different entirely, but thats just because they all look different, and it gives us an interestingly wide spectrum of hot to god**** ugly. Yet oddly enough, you STILL can't tell who's from what background because it doesn't show up at all, unless they're wearing a jew cap in broad daylight.
Now asians, you CAN tell the differences, because every asian girl looks like same, like I said before, you notice the differences because thats the only difference, and hell it's still only so much as the way the eye curves, or shape of the nose a little bit.